> For crying out loud! Which way are the plates on all of
> the other plate dissipating caps oriented? Look at those
> for 813's, 4-400's, 4-1000's.....they'e all with
> horizontal fins>>
Tubes with large stems through glass or ceramic envelope
often need heat dissipation from the seal area. The better
heatsinks have vertical fins or fins oriented in line with
the airflow, although anything will work with enough air and
area.
External anode tubes aren't helped a bit by a "heatsink"
although it is sometimes a way to get a connection (although
often not the best way).
. I don't recall seeing any of them with vertical plates
anywheres. >>
I certainly remember vertical fins on 3-400 and 3-500 tubes
with chimneys. While the cooling is more effective when fins
line up with the airflow, a large enough dissipating cap
with improperly aligned fins could and often does work just
fine.
Personally I wouldn't waste my time adding a heat
dissipating cap on an external anode tube but for some of us
it can be convenient way to get an attachment point for the
anode connection. We just shouldn't pretend it is doing
anything meaningful for keeping seals cool.
73 Tom
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